current.yaml

date: Pending

behavior_changes:
# *Changes that are expected to cause an incompatibility if applicable; deployment changes are likely required*

minor_behavior_changes:
# *Changes that may cause incompatibilities for some users, but should not for most*
- area: http2
  change: |
    Sets runtime guard ``envoy.reloadable_features.http2_use_oghttp2`` to true by default.
- area: dfp
  change: |
    Setting :ref:`dns_query_timeout
    <envoy_v3_api_field_extensions.common.dynamic_forward_proxy.v3.DnsCacheConfig.dns_query_timeout>`
    to 0 will disable the the Envoy DNS query timeout and use the underlying DNS implementation timeout.
- area: ext_proc
  change: |
    When :ref:`mode_override <envoy_v3_api_field_service.ext_proc.v3.ProcessingResponse.mode_override>`
    headers/trailers modes have the value ``DEFAULT`` (unset), no change will be made to the processing
    mode set in the filter configuration.
- area: ext_proc
  change: |
    Ignore request_header_mode field of :ref:`mode_override <envoy_v3_api_field_service.ext_proc.v3.ProcessingResponse.mode_override>`
    when comparing the mode_override against allowed_override_modes as request_header mode override is not applicable.

bug_fixes:
# *Changes expected to improve the state of the world and are unlikely to have negative effects*
- area: dfp
  change: |
    Fixes a bug when loading a DNS cache entry with an empty authority/host header. This fix can be reverted by setting
    runtime guard ``envoy.reloadable_features.dfp_fail_on_empty_host_header`` to ``false``.
- area: router
  change: |
    Fixed query parameter matcher to properly implement
    :ref:`present_match <envoy_v3_api_field_config.route.v3.QueryParameterMatcher.present_match>`. Previously, the
    matcher would incorrectly handle ``present_match`` configurations by treating them as default present checks. This
    behavior can be temporarily reverted by setting runtime feature
    ``envoy_reloadable_features_enable_new_query_param_present_match_behavior`` to ``false``.
- area: tcp_proxy
  change: |
    Fixes a bug when TCP is tunneled over HTTP and upstream connection closed before response headers received to the stream.
    The fix is to run the retry logic in a different event loop iteration to allow cleanup of the closed connection before retrying.
    This fix can be reverted by setting runtime guard ``envoy.reloadable_features.tcp_proxy_retry_on_different_event_loop`` to ``false``.
- area: oauth2
  change: |
    Fixed OAuth2 credential injector to send scope (if specified) to authorization server when requesting new access
    token using ``client_credentials`` flow.
- area: original_src filter
  change: |
    Set IP_BIND_ADDRESS_NO_PORT socket option in the original_src filter to prevent port exhaustion caused by the
    kernel prematurely reserving ephemeral ports. This behavior change can be reverted by setting runtime guard
    ``envoy.reloadable_features.original_src_fix_port_exhaustion`` to ``false``.

removed_config_or_runtime:
# *Normally occurs at the end of the* :ref:`deprecation period <deprecated>`
- area: http
  change: |
    Removed runtime guard ``envoy.reloadable_features.consistent_header_validation`` and legacy code paths.
- area: http
  change: |
    Removed runtime guard ``envoy.reloadable_features.sanitize_http2_headers_without_nghttp2`` and legacy code paths.
- area: access_log
  change: |
    Removed runtime guard ``envoy.reloadable_features.upstream_remote_address_use_connection`` and legacy code paths.
- area: xds
  change: |
    Removed runtime guard ``envoy.reloadable_features.xdstp_path_avoid_colon_encoding`` and legacy code paths.
- area: thread_local
  change: |
    Removed runtime guard  ``envoy.reloadable_features.allow_slot_destroy_on_worker_threads`` and legacy code paths.
- area: runtime
  change: |
    Removed runtime flag ``envoy.reloadable_features.reject_invalid_yaml`` and legacy code paths.
- area: dns
  change: |
    Removed runtime flag ``envoy.reloadable_features.dns_details`` and legacy code paths.
- area: local_ratelimit
  change: |
    Removed runtime guard ``envoy.reloadable_features.no_timer_based_rate_limit_token_bucket`` and legacy code paths.

new_features:
- area: dfp
  change: |
    The DFP cluster will now use the async lookup path to do DNS resolutions for null hosts. This behavioral change
    can be temporarily reverted by setting runtime guard ``envoy.reloadable_features.dfp_cluster_resolves_hosts``
    to false.
- area: oauth2
  change: |
    Add the option to specify SameSite cookie attribute values for oauth2 supported cookies.
    To specify ``SameSite`` attribute, choose one of the values from ``strict``, ``lax`` or ``none``. If not specified,
    a default value of ``disabled`` will be assigned and there will be no ``SameSite`` value in the cookie attribute. See
    :ref:`apply_on_stream_done <envoy_v3_api_field_extensions.filters.http.oauth2.v3.OAuth2Config.cookie_configs>`
    for more details.
- area: spiffe
  change: |
    Added :ref:`trust_bundles
    <envoy_v3_api_field_extensions.transport_sockets.tls.v3.SPIFFECertValidatorConfig.trust_bundles>`
    to the SPIFFE certificate validator configuration. This field allows specifying a SPIFFE trust
    bundle mapping as a ``DataSource``. If both ``trust_bundles`` and ``trust_domains`` are specified,
    ``trust_bundles`` takes precedence.
- area: resource_monitors
  change: |
    Added support to monitor container CPU utilization in Linux K8s environment using
    :ref:`existing extension <envoy_v3_api_msg_extensions.resource_monitors.cpu_utilization.v3.CpuUtilizationConfig>`.
- area: lua
  change: |
    Added :ref:`virtualClusterName() <config_http_filters_lua_stream_info_virtual_cluster_name>` API to the Stream Info
    Object to get the name of the virtual cluster matched.
- area: tap
  change: |
    Added an UDP extension for tap custom sink.
- area: udp_proxy
  change: |
    Added support for outlier detection in UDP proxy. This change can be temporarily reverted by setting runtime guard
    ``envoy.reloadable_features.enable_udp_proxy_outlier_detection`` to ``false``.
- area: http
  change: |
    Added alpha support for asynchronous load balancing. See
    :ref:`load balancing policies overview <arch_overview_load_balancing_policies>` for more details. Support can
    be temporarily reverted by setting runtime guard ``envoy.reloadable_features.async_host_selection`` to ``false``.
- area: ext_proc
  change: |
    Adding support for a new body mode: ``FULL_DUPLEX_STREAMED`` in the ``ext_proc`` filter
    :ref:`processing_mode <envoy_v3_api_field_extensions.filters.http.ext_proc.v3.ExternalProcessor.processing_mode>`.
- area: proxy_protocol
  change: |
    Added support for injecting custom Type-Length-Value (TLV) entries into the Proxy Protocol v2 header for upstream
    transport sockets. Custom TLVs can be defined both in the endpoint host's typed metadata under the
    ``envoy.transport_sockets.proxy_protocol`` namespace and at the configuration level via the ``ProxyProtocolConfig``'s
    ``added_tlvs`` field. Host-level TLV definitions override config-level entries when the same type is specified, allowing
    default TLVs to be set globally, while enabling further per-endpoint customizations.
- area: formatter
  change: |
    Added ``QUERY_PARAM`` support for substitution formatter. See :ref:`access log formatter <config_access_log_format>`
    for more details.
- area: http
  change: |
    Added :ref:`max_metadata_size <envoy_v3_api_field_config.core.v3.Http2ProtocolOptions.max_metadata_size>` to make
    HTTP/2 metadata limits configurable.
- area: tcp_proxy
  change: |
    Added support for :ref:`backoff_options <envoy_v3_api_field_extensions.filters.network.tcp_proxy.v3.TcpProxy.backoff_options>`
    to configure the backoff strategy for TCP proxy retries.
- area: redis
  change: |
    Added support for multi-key commands on transactions.
- area: dfp
  change: |
    Added a feature to disable DNS refresh on failure by setting :ref:`disable_dns_refresh_on_failure
    <envoy_v3_api_field_extensions.common.dynamic_forward_proxy.v3.DnsCacheConfig.disable_dns_refresh_on_failure>` to
    ``true``. By enabling this feature, the failed hosts will now be treated as a cache miss.
- area: xds
  change: |
    Reporting a locality_stats to LRS server when ``rq_issued > 0``, disable by setting runtime guard
    ``envoy.reloadable_features.report_load_with_rq_issued`` to ``false``.
- area: local_rate_limit
  change: |
    Added support for dynamic token buckets in local rate limit filter for http requests.
- area: attributes
  change: |
    Added :ref:`attribute <arch_overview_attributes>` ``upstream.locality`` to obtain upstream locality information.
- area: dynamic_modules
  change: |
    Added the initial support for shared libraries to be loaded by Envoy at runtime. Please refer to the overview documentation for the
    feature :ref:`here <arch_overview_dynamic_modules>`.

deprecated: